Revolving chair.



Patented Sept. I7, |90I.

2 sheets-sheet l.

REVULVING CHAIR.

(Application led Oct. 18, 1900.)

. J. ELLENBECKER. y

(No Model.)r

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. No. 682,844. Patented Sept. I7, |901.

J. ELLENBEGKEB.

BEVULVING CHAIR.

` (Application led pct. 18, 1900.) (N0 Model.) l 2 Shees'-Sheef 2 uflllll

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ws 7 /Pw /12 UNITED STATES PATENT OFFICE.

JOHN ELLENBECKER, OF PORT WASHINGTON, WISCONSIN.

REvoLvlNc CHAIR.

SPECIFICATION forming part of Letters Patent No. 682,844, datedSeptember 17, 1901. .Aopnoonoo noa 'oooooor 1s. 1900. sori'oi no.33.440. (No model.)

To all wiz/0m it may con/cerro: p

Be it known that I, JOHN ELLENBECKER,

Iof Port Washington, county of Ozaukee, and

State of Wisconsin, have invented a new and useful Improvement inRevolving Chairs,of which the following is a description, referencebeing had to the accompanying drawings, which are a part of thisspecification.v

My invention has relation to improvements in revolving chairs. l

The object is to provide improved means whereby the seat of the chair isnot only made revoluble, but at the same time provision is secured forraising and lowering said seat.

With the above primary object and other incidental objects in view theinvention consists of the devices and parts or their equivalents, ashereinafter set forth.

In the accompanying drawings, Figure 1 is an elevation of the invention,partly in section, on a plane indicated by the line 1 l of Fig. 2. Fig.2 is an inverted plan view of Fig. 1 on an enlarged scale. Fig. 3 is asection on the line 3 3 of Fig. 4. Fig. 4 is a detail of the lowerportion of the mechanism at right angles to the position shown in Fig. 1with parts broken away. Fig. 5 is a central section of theball-bearing.Fig. 6 is an inverted plan view of Fig. 5 with a part broken away. Fig.7 is an elevation, partly in vertical section, of a modiiied form ofconstruction. A Fig; 8 is an inverted plan view of Fig. 7 on an enlargedscale, and Fig. 9 is a fragmentary view.

Referring to the drawings, the numeral 10A indicates the hub of thechair-iron of an ordinary form of construction and provided with theusual vertical recesses 11, in which` the upper ends of the chair-legsfit. The hub is provided with a smooth bore 12, and in thel Sheet l formof construction is also provided with a downwardly-projecting extension13. Fitting in the smooth bore of the'hubis a sleeve 14, provided withinterior threads and having its upper portion provided with a shoulder15,'preferably beveled, which shoulder rests upona beveled seat 16 atthe upper end of the hub. By the provision of this shoulder and seat thesleeve is properly supported in the hub. In order to prevent withdrawalof the sleeve upwardly out of the hub, in the Sheet 1 form ofconstruction I provide the exterior of said sleeve, near the lower endthereof, with an annular recess 17, which is engaged by the inner end ofa screw 18, passing through the downward extension 13 of the hub. Theupper extremity of the sleeve,above the upper end of the hub, is formedor provided with a hand-wheel 19, by which the sleeve is convenientlyturned in the hub. Fitting in the sleeve revolubly is the chairseatspindle 20, which depends from the spind le-head 21. The spindle istubular, and its lower end terminates short of the lower end of thesleeve. Said lower end of the spindle is turned inwardly slightly toform an annular liange 22. Below the lower end of the spindle is a nut23, the exterior threads of said nut being engaged by the interiorthreads of the sleeve. This nut is provided centrally therethrough withan opening 24, preferably slightly elongated and of rectangular shape.This nut 23 is also provided with a recess 25, extending downwardly fromthe upper portion of said nut for a desired distance, and the lower endof this recess communicates with a laterally extending recess 25. Ifdesired, ball-bearings may be interposed between the top of the nut andthe lower end of the chair-seat spindle. I prefer that the ball-bearingsbe arranged in the improved` form of ball-bearing case shown in detailin Figs. 5 and 6 of the drawings.v .This case con sists of two groovedrings 26 26, which are arranged with the grooves facing, andbearingballs 27 are placed in the registering grooves. The rings 26 areheld together by means of an inner annular band 28, provided at itsupper edge with an outstanding liange 29, which rests and is seated npona shoulder 30 of the upper ring member 26. The lower edge of `the bandis provided with outwardly-bent fingers 31, which extend beneath ashoulder 32, formed on the lower ringlnember. It isobvious that by thisarrangement not only are the two ring members 26 at liberty to revolvefreely, but also the antifriction-balls 27 are free to revolve betweenthe rings. Again, by reason of the fact that the bearing-surfaces of therings 26 are convex friction between the rings and the spindle and thenut is reduced to the minimum.

In the Sheet 1 form of construction in order to prevent the nut 23 fromturning I pass through the rectangular opening 24 thereof asimilarly-shaped rod 33, which may extend upwardly into the spindle fora desired distance. It also extends downwardly below the nut through across-piece 34, extending across the lower end of thedownwardly-projecting extension 13 of the hub. The lower extremity ofthe rod is threaded to receive a nut 35, which is turned up tightlyagainst the under side of the cross-piece, and thereby serves tosecurely hold the rod in place.

In order to connect the spindle 2O with the nut, so as to prevent thewithdrawal of the spindle out of the sleeve in moving the chair from oneplace to another, I provide a short bar 36, which is fitted in therecess 25. This bar extends upwardly above the nut and into the lowerend of the spindle for a short distance. Its opposite ends are providedwith outwardly-extending hooks 37 37', the former hook overlapping theflange 22 of the spindle and the latter hook engaging the recess 25 ofthe nut.

From the foregoing description it will be seen that when a person isoccupying the chair the seat is free to turn by reason of the fact thatthe spindle 20, depending from the spindle-head 21, (which head issecured to the chair-seam is revoluble in the sleeve 14. If now it isdesired to either raise or lower the seat, said raising or lowering maybe accomplished by turning the hand-Wheel 19 in the proper direction.This will necessarily rotate the sleeve 14, and consequently cause thethreads of said sleeve to en gage the threads of the nut 23. As the nutis held fast against turning by the rod 33, said nut is necessarilycaused to move vertically either up or down in accordance with thedirection of turning of the hand-Wheel, and consequently thereby adjustthe vertical height of the chair-seat by raising or lowering the spindle20.

While I prefer to use the antifriction-bearings hereinbefore described,inasmuch as the spindle is thereby permitted to turn with the leastpossible friction, yet, if desired, the said bearings may be entirelyomitted and the nut made to bear directly against the lower end of thespindle and successful results obtained.

By my invention I provide a construction which is strong and enduring incharacter and capable of withstanding a long period of Wear and usage.

In the modified form (shown on Sheet 2 of the drawings) I dispenseentirely With the downwardly-projecting extension 13 from` the hub andalso omit the cross-bar 34, against which the nut 35 turns and therebyholds the rod. In lieu of said construction I bend outwardly the lowerend of the rod 33, as indicated by the numeral 38, and then bend saidrod upwardly, as indicated by the numeral 39, the upper extremity beingseated in a recess 40 in the hub. A screw 41 is passed esas@ through thehub and engages this upwardly-l bent portion 39. By this provision it isobvious that the rod 33 is held fast and' accomplishes the same functionas the construction shown on Sheet 1 of the drawings. In the modifiedform I also show the hand-wheel 19 as separate from the sleeve 14 andsecured to the upper projecting end of said sleeve by means of rivets.In order to prevent the withdrawal of the sleeve from the hub instead ofproviding the annular recess 17 in the lower end of the sleeve and thescrew 18 fitting in said recess, as in the Sheet 1 form of construction,I provide the upper end of the sleeve with an annular shoulder 42, andsecured to the top of the hub by means of a screw or otherwise anangnlarly-bent finger 43, which overlaps said annular shoulder.

What I claim as my invention is-r- 1. In a revolving chair, thecombination of ahub, an interiorly-threaded sleeve revoluble in the hub,means for turning the sleeve, means for preventing vertical movement ofthe sleeve in the hub, a spindle revoluble in the sleeve, a nut in thesleeve and adapted to act against the spindle, said nut having itsthreads engaged by the threads of the sleeve, and means for preventingrotary movement of the nut, whereby when the sleeve is ro tated the nutis moved vertically and the spindle thereby caused to be movedtherewith. I

2. In a revolving chair, the combination of a hub, aninteriorly-threaded sleeve revoluble in the hub, said sleeve extendedabove the hub and formed or provided with a hand-wheel for turning thesame, means for preventing vertical movement of the sleeve in the hub, aspindle revoluble in the sleeve, a nut in the sleeve and adapted to actagainst the spindle and having the threads thereof engaged by thethreads of the sleeve, and means for pre'- venting rotary movement ofthe nut,` whereby when the sleeve is rotated the nut isinoved verticallyand the spindle thereby caused to be moved therewith.

3. In a revolving chair, the combination of a hub,an-interiorly-threaded sleeve revoluble in the hub, means for turningthe sleeve, means for preventing vertical movement of the sleeve in thehub, a spindle revoluble in the sleeve, a nut in the sleeve and adaptedto' act against the spindle, said nut having its threads engaged by thethreads of the sleeve,

and a rod fast to a. iixed part and engaging the nut, and adapted toprevent rotation of said nut. A

4. In a revolving chair, the combination of a hub provided with adownward extension, said extension having its lower end intersected by across-piece, an interiorly-th readed sleeve revoluble in the hub, meansfor turning the sleeve, means for preventing vertical movement of thesleeve in the hub, a spindle revoluble in the sleeve, a nut in thesleeve rio rig

and adapted to act against the spindle, said nut having its threadsengaged by the threads of the sleeve, and said nut also having areciangular opening, a rod passing through the cross-piece of thedownward extension of the hub and engaging the rectangular opening ofthe nut, and a nut engaging the threaded eX- tremity of the rod andturned against the cross-piece.

5. In a revolving chair, the combination of a hub, aninteriorly-threaded sleeve revoluble in the hub, means for turning thesleeve, means for preventing vertical movement of the sleeve in the hub,a tubular spindle revoluble in the sleeve, the lower end of said spindleprovided with an inwardlyturned iiange, a nut in the sleeve and adaptedto act against the spindle, and having its threads engaged by thethreads of the sleeve, a bar having hooked ends, one of said hooksengaging a recess in the nut, and the other hook engaging over theflange of the spindle, and means for preventing rotary movement of thenut, whereby when the sleeve is rotated the nut is moved verticallyandthe spindle thereby caused to move therewith.

6. In a revolving chair, the combination of a hub, aninteriorly-threaded sleeve revoluble in the hub, said sleeve providedwith anannular recess, a screw passing through the hub and engaging therecess, means for turning the sleeve, a spindle revoluble in the sleeve,a nut in the sleeve and adapted to act against the spindle, said nuthaving its threads engaged by the threads of the sleeve, and means forpreventing rotary movement of the nut, whereby when the sleeve isrotated the' nut is moved vertically and the spindle thereby caused tomove therewith.

. In testimony whereof I affix my signature in presence of twowitnesses.

JOHN ELLENBEOKER.V

Witnesses:

WM. AHLHAUSER, I BERNHARD FRANZEN.

